Rotary perforating apparatus



Aug. 28, 1956 D. w. c. SPENCER ROTARY FERFORATING APPARATUS 3Sheets-Sheet 1 Filed March 26, 1954 INVENTOR ATTORNEY Aug. 28, 1956 o.w. c. SPENCER 2,760,576

ROTARY PERFORATING APPARATUS Filed March 26, 1954 5 Sheets-Sheet 3 umnnn-nunnnn Z5 n nooununnunum'nunun INVENTOR flIlDLEY W C. SPENCERATTORNEY ROTARY PERFORATING APPARATUS Dudley W. C. Spencer, Wilmington,DeL, assignor to E. I. du Pont de Nernours and Company, Wilmington,DelL, a corporation of Delaware Application March 26, 1954, Serial No.418,917

9 Claims. (Cl. 16499) This invention relates to improvements in webperforators and particularly to rotary perforating apparatus utilizedfor forming the guide perforations in photographic film and the like.

It is essential that the perforations in photographic film be preciselycut and to a close pitch tolerance, since the high speed feeding of thefilm is dependent on the exact matching and engagement of the feedsprocket wheels with the film perforations. At the same time, from thestandpoint of economical production, such film perforation must beaccomplished at extremely high speeds. Apparatus for this purpose shouldbe as simple of construction as practicable, to reduce maintenance cost,While being compact and rugged to meet the demands of modernmanufacturing operations.

A principal object of this invention is to provide a film perforatorwhich is adapted to operations at very high speeds. Another object is toprovide an apparatus having individual perforator assemblies which areabsolutely fixed in their orientation with respect to the drivingmechanism, so that an extremely high precision of perforation isobtained at all times. Another object is to provide a perforatingapparatus wherein individual perforator assemblies may be readilyremoved for re sharpening or servicing whenever such rehabilitationbecomes necessary in the course of service life. Yet another object ofthis invention is the provision of a perforating apparatus which iscompact, simple and cheap in first cost and which has a relatively longoperating life.

The manner in which these and other objects of this invention areattained will become apparent from the detailed description and thefollowing drawings in which:

Figure l is a side elevation, viewed partly in section, of oneembodiment of apparatus constructed according to this invention,

Figure 2 is a full-section view taken along line 2-4 of Fig. 1,

Figure 3 is a full-section view taken along line 3-3 of Fig. 1, showinga length of film in process of perforation,

Figure 4 is a fragmentary side elevation, partly in section, of thewheel supporting the perforator assemblies, the assemblies being omittedtherefrom,

Figure 5 is a full-section view taken along line 5-5 of Fig. 4,

Figure 6 is a side elevational view of a modification of perforatorassembly, showing the camming edge of the associated cam ring,

Figure 7 is a rear end elevation of the perforator assembly shown inFigure 6 looking in the direction of the punch and die elements,

Figure 8 is a front end elevation of the perforator assembly of Figs. 6and 7, and

Figure 9 is a plan view of a length of film perforated by the apparatusof this invention.

Generally, the apparatus of this invention comprises a rotatableweb-supporting wheel which is journaled on a stationary shaft, whichwheel carries a multiplicity of hired states Pate perforator assembliesmounted in fixed position around the periphery of the wheel, and one ora pair of circular cam rings mounted eccentric to the wheel, and drivenrotatably in unison therewith, the cams overlying the perforatorassemblies on the Wheel and progressively urging the punch elements ofthe perforators into cutting position and then clearing themsufiiciently for their withdrawal in sequence during rotation of thewheel and cam rings. In a preferred embodiment the apparatus is adaptedto the simultaneous perforation of both edges of the film or other web,and special provision is made to feed the film into the apparatus andcollect the finished product after perforation without damage theretodue to scratching or pinching by the machine parts.

Referring to Fig. 1, one embodiment of this invention comprises a mainshaft 5 which is drilled axially at 6 to permit vacuum Withdrawal ofcut-out film slugs in the course of operations. Shaft 5 is stationaryand is supported in cantilever relationship with respect to the machineframe 8, being mounted with a slip fit Within drilled passage 9 formedin the frame. Shaft 5 is provided with an 'arcuate keyway 10, receivingthe inner end of quickrelease lever 11 provided With a pivot pin 12,which is rotatably supported within a drilled hole 13 in frame 8, sothat the shaft and the entire mechanism supported by the shaft may bereadily withdrawn for servicing or replacement whenever required. Anannular vacuum sealing washer 16 is provided coaxial shaft 5 at theframe end of the shaft to seal drilled passage 6 against air leakagefrom the outside.

Drive bushing 19 is journaled on shaft 5 through bearings 20 and theouter end is provided with gear teeth 21 meshing with flexible drivebelt 22, which may be a conventional Gilmer belt or the like. Cam ring25 is fixedly attached to bushing 19 by set screws, one of which isshown at 26 in Fig. 1 and, in the embodiment shown, cam ring 25 ismounted concentric with shaft 5.

The film-supporting wheel 29, shown in Fig. l, is unitary inconstruction to permit the simultaneous perforation of both edges of thefilm, only the left-hand half of the Wheel, i. e., that part shown insection, appearing in Fig. 1. In the embodiment shown, wheel 29 isjournaled eccentrically on shaft 5 through a pair of bearings 30, one ofwhich is hidden from view behind cam ring 25', which accomplishes thesame function for the right-hand side of the film as 25 does for theleft-hand side. Wheel 29 is provided with a number of radial vacuumpassages 32 (refer also Fig. 3) which open at their inward ends into anannular passage 33 formed on the periphery of shaft 5. The outer ends ofpassages 32 are disposed adjacent to the undersides of the die elements36 of the perforators and are of somewhat larger diameter than the dieelements to facilitate the vacuum removal of cutout film slugs.Preferably, passages 32 are slightly tapered to a larger bore in thedirection of shaft 5 to facilitate the ready withdrawal therethrough ofthe cutout slugs.

The embodiment of apparatus hereinabove described utilizesconcentrically mounted cam rings 25 and 25' and an eccentrically mountedwheel 29; however, it will be particularly understood that thisrelationship may equally well be reversed, i. e., wheel 29 can beconcentrically mounted and cam rings 25 and 25' eccentrically mounted,since relative eccentricity between these members is the solerequirement for proper functioning. This relative eccentricity can berather small and, in the embodiment detailed, which is provided withninety-two individual perforators, the cam rings of which have maximumoutside diameters of 7", is With the eccentricity indicated at a in Fig.1, the inner annular edges of cam rings 25 and 25' are closest to theaxis of wheel 29 at the six oclock position, or point c of Fig. 3, andduring an appreciable angle of rotation preceding this point the camrings depress the punch elements of the perforators into theirassociated die elements, thereby effecting the perforating operation.The clearance between the inner annular edges of cam rings 25 and 25and'the axis of wheel 29 is greatest diametrically opposite theperforating region, reaching its maximum at the twelve oclock positionof Fig. 3, and the punch and'die elements of the perforators are clearof one another, and of the film, over an appreciable angle of travelpreceding and following this point, so that film can be readily fed toand withdrawn from the device in this region without scratching due tocontact with the elements of the perforators carried by the apparatus.

Referring to Fig. 3 especially,'it will be noted that shaft is drilledwith four passages 38 of somewhat larger diameter than passages 32,which passages open at their outer ends into annular passage 33 and attheir inner ends into passage 6. The course of cut-out slugs is thusfrom the perforators through die element's 36 and passages 32, 33 and 38in sequence, thence into'drilled passage 6 and out to the left, as seenin Fig. l, to a suitable collector maintained under vacuum by equipmentnot shown. It will be noted that the drilled passage 6 of Fig. 1 extendsto the right where it communicates with an identical slug removalpassage arrangement for the right-hand perforating side, which isenclosed in cam ring 25'.

Referring to Figs. 1 and 2, film supporting wheel 29 is provided at itsend adjacent drive bushing 19 with two drive pins 40 securely attachedto the wheel, which drive pins support individual rollers 41 journaledon the pins through bearings 42. Disposed between the adjacent ends ofdrive bushing 19 and film supporting wheel 29, in loose movablerelationship thereto, is plate 43 provided with radially machinedrecesses 44 adapted to cooperate with rollers 41 in slide fit contact. Apair ofrollers 45, similar in all respects to rollers 41, but disposedin alternation therewith at an angular spacing of 90", are journaledthrough bearings 46 on pins 47 fixedly secured to drive bushing19. Thus,the assembly 43, together with the pairs of rollers 41 and 45,constitutea type of Oldham coupling, and it will be understood thatrotation of drive bushing 19 through drive belt 22 produces rotation offilm-supporting wheel 29 by virtue of the positive coupling connectingthe bushing and wheel elements.

Cam ring 25 is partially broken awayin Fig. l to show the driveconnection between the right-hand side of wheel 29 and right-hand camring 25', the-coupling. being in all respects identical to that alreadydescribed, except that the direction of power transmission is in thereverse direction to that for the left-hand side, i.-e., through pins40', rollers 41' journaled thereon, plate 43', rollers 45' andpins 47'to cam ring 25', which is journaled on shaft 5 through bearings notshown.-

Referring to Figs. 4 and 5, the periphery of wheel 29 is machined aroundthe entire outside expanse with a multiplicity of axially alignedgrooves 50 which are adapted to support the perforations in fixedcircumferential relationship with respect to each other. Circumferentialgrooves 51 are provided for the reception of guide-portions on theperforators to locate them axially ofthe wheel. Thus, the pitch ofperforation and the spacing of perforations with respect to the edges ofthe film is insured to an absolute degree during operation.

Two types of perforators are hereinafter described, the first type beingshown in detail in Fig. 1, while a modification is shown in Figs. 6, 7and S. The perforators shown in Fig. 1 areof the automatic-returntype,each comprising a base portion 52 undercut at 53, thebase portion beingprovided with a beveled front foot configuration at 54 adapted to fitwithin circumferential groove 51. The perforators are also provided witha rear foot portion 55 adapted to fit within the axial groove 50 onwheel 29 allotted to each individualperforator. The

perforators are secured in grooves 50 in fixed relationship.

to wheel 29 at the rear by arcuate spring stock strap 59, provided witha curved outer edge overlying the rear ends of all of the perforatorsand attached to wheel 29 by machine screws 60. The front ends of theperforators for both edges of the film are similarly retained againstwheel 29 by arcuate spring stock strap 61, which is overlaid by arcuatefilm support members 62, a multiplicity of these supports being providedin complete encirclement of wheel 29. The outer surfaces of supportmembers 62 arernachined to a high surface" finish to avoid marring ofthe film during'the perforating operation and are provided withcountersunkholes to receive snugly the heads of machine'screws 63 whichengage with. tapped threads in wheel 29, thereby providing commonattachment of elements61 and 62 with'the wheel.

The top surface of each of the perforator bases 52 is provided with alimiting stop lug 66, which limits the radial movement of the associatedpunch element 67 into registration with the associated die element 36.Each punchelement 67 is fixedly secured to the outer end of a springmetal support 68 and an outer spring metal leaf 69 is provided tooverlie at its outer end punch element 67, thereby furnishing a wearsurface for abutment with the carnming surface of the associated camrings 25 or 25. Support 68 and leaf 69 are attached as cantilevers atthe ends opposite the punch to perforator base 52 with rivets 70.Fromthe foregoing it will be seen that all elements of the perforatorsare assembled in fixed relationship to one another, so that it:isimpossible for a punch to become misaligned with its associated die asa result of wear in the course of use. Consequently, hard metals can beutilized in the construction of both punches and dies with completeassurance that no difiiculties will arise from metal interference. Theuse of flexible spring supports 68, carrying thepunches 67, inconjunction with stop lugs 66 renders unnecessary the use of highlyaccurate cam profiles on rings-25 and 25' and contributes to economy infabrication. Stop-lugs 66 are likewise useful as reference surfaces insharpening punches 67 after they have-become dull as a result ofextensive service.

Referringto Figs. 1 and 3, the operation of the apparatus of thisinvention is hereinafter described for the condition ofcounter-clockwise rotation of wheel 29 and cam rings 25 and 25*,although it will be understood that operation in the reversedirection'is equally feasible if the feed of the film isreversed- Theunperforated film-72 enters the apparatus-at the left, as seen. in Fig.3, and is carried around wheel 29 during its rotation through anany oftheelements of the perforating apparatus. This is convenientlyaccomplished by passing the film between pairs of-peripherally groovedidling rollers 74 located ahead of the entrance point and past the exitpoint, re-

spectively, which contact-exclusively the edges of the ruinningfilm andtemporarily bow it. This bowing is indicated at 75, the degree of whichis sufficient so that the film edges are laterally clear of the punches67, their supports 68 and the edges of cam rings 25 and 25 in the courseof assuming the normal flat state between the open punch and die sets atpoints I) and a. During the first of travel from point b to point e,punches 67 are cammed by rings 25 and 25' towards their associated dies36, cutting the perforations in-the film, the punchesattaining theirmaximum inward advance at point 0. Cutout film slugs'drop-into passages32 and, either at once or during subsequent rotation of wheel 29, areejected from the apparatus through passages 33, 38 and 6.

Duringrotation of wheel 29 from point 0 to point d, punches 67-a1'eprogressively withdrawn from dies 36 as spring supports 68 and leaves 69are permitted to return to their normal, unstressed positions underincreasing clearance between cam rings 25 and 25 and wheel 29 due to therelative eccentric motion of these members. At point d, the punches 67are completely free of the film and draw otf is therefore readilyeffected under the bowing action of the exit rollers 74. Fig. 9 is aplan view of a short length of perforated film 73 produced on apparatusaccording to this invention. Experience in operation has demonstratedthat extreme precision of pitch and spacing is obtained at a typicalrotational speed of 360 R. P. M., corresponding to a linear filmthroughput of 500 ft./ min.

At start up the lead end of the bowed film to be perforated is fed intothe apparatus and carried around wheel 29 as the wheel, together withthe cam rings, is turned by hand. When the perforated end emerges fromthe apparatus in the vicinity of point d, it is threaded between thepair of bowing rolls 74 along the line of exit and thence led to atake-up reel or other device, whereupon powered operation can beinitiated. It will be understood that the perforator punches and diesthemselves, by engagement with the film, function to some degree assprocket teeth and permit film feed through the apparatus undersubstantial tension. This is an advantageous feature of this invention,because it obviates stripping devices and, by regulation of the tensionapplied to the film during perforation, as by feed over weighted idlerrolls or similar devices, it is possible to control the pitch ofperforation to an extremely close tolerance.

Figs. 6, 7 and 8 show an alternate form of perforator which is adaptedto use with the wheel 29 already described with reference to Figs. 4 and5. The perforator base 80 is similar in form to perforator base 52hereinbefore described and is provided with front and rear foot portions81 and 82, respectively, the former of which seats in groove 51 and thelatter in its allotted groove 50. This design of perforator is mountedon the wheel 29 in an identical manner to that described for theperforator of Fig. 1. The principal difference between the twoperforator designs is the provision for positive actuation of the punchin the design of Figs. 68, which is achieved by mounting the punch 67 ona rigid support member 83 formed with a clevis 84 at its inner end,member 83 being pivotally mounted for free movement in a directiongenerally radial of wheel 29 on pin 85 journaled in base 80. The boresof the clevis legs receiving pin 85 are provided with diametrical slots86 and are drilled somewhat undersize, so that a tight assembly of thepins in the bores is obtained by the inherent spring action of theconstruction, thus compensating for frictional wear which wouldeventually result in objectionable looseness at these points. The upperforward end of support member 83 is provided with a forked follower 87adapted to receive in sliding contact therewith the camming edge of amring 25, which is in this case preferably formed to a somewhat roundedbead at 88 to reduce friction to a minimum.

The operation of the perforator of Figs. 6-8 is in all respectsidentical with that described with reference to the perforatorconstruction of Figs. 1 and 3, except that the advance and withdrawal ofthe punch 67 with respect objectionable because of permanent deformationof the.

film.

The double-edge perforating apparatus hereinabove de-' scribed in detailis preferred for film perforation; however, where single-edgeperforation is desired, it will be apparent that a single cam ringoperating in conjunction with a wheel provided with an appropriatenetwork of vacuum slug-removal passages constructed as herein disclosedcan be advantageously utilized, and both single and double-perforatingembodiments are therefore comprehended within my invention.

While the embodiment of this invention which has been herein describedin detail is particularly preferred, because the arrangement of theapparatus components permits ready accommodation of the design toconventional film manufacturing apparatus supplying raw film to andreceiving perforated film from the device, and from the standpoint ofmaintenance and the substitution of particular sizes of apparatus foruse with particular widths of film, it Will be understood that the shafton which the filmsupporting Wheel is mounted may be journaled at bothends, as distinguished from being mounted in cantilever relationshipand, furthermore, that the shaft may be supported either horizontally,vertically or at any other angle suited to the particular requirementsof the user. Also, while a vacuum cut-out slug withdrawal system ispreferred for best results, a superatmospheric pressure air jet directedradially inward toward the shaft at a point following the perforationZone will clear cut-out material quite as effectively as a vacuum. Acombination of a superatmospheric blast from the outside and vacuumapplied on the inside has added advantage and, of course, positive airpressure may be applied to a region following the perforation zone fromthe inside of the wheel in a direction opposite from that effected byvacuum removal as hereinabove described. In the event that the slugs areremoved by blasting outwardly of the Wheel 'a vacuum head may beutilized for collection and transfer to a suitable waste receptacle or,where the shaft is mounted vertically, th lowermost cam ring may beprovided with suitable openings in the region of its attachment to theshaft to permit gravity collection of the slugs. It is also possible torely exclusively on external vacuum or pressure applying apparatus, orboth, for slug removal, with complete elimination of the passages in theshaft and the film-supporting wheel, 'and it is intended to encompassall of these and any equivalent variations within the term means forcut-out slug removal as this term is hereinafter employed in the claims.

It will further be apparent that a great variety of driving arrangementsmay be utilized for turning both the cam rings and the web-supportingwheel and, while the use of loose couplings as hereinabove described isparticularly preferred, other driving arrangements known to personsskilled in the art are equally efiective for the purpose contemplated.

From the foregoing it will be understood that I have provided animproved perforating apparatus useful in the perforation of photographicfilms or like web materials and that many modifications may be made inmy invention without departing from its essential spirit, wherefor Iintend to be limited only by the scope of the following claims.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. A rotary perforating apparatus comprising the combination of a frame,a stationary shaft journaled on said frame, cam rings corresponding innumber to the number of edges of the web it is desired to perforatejournaled on said shaft, each of said cam rings being provided with acamming surface, a web-supporting wheel journaled on said shaft, one ofthe pair consisting of said cam rings and said web-supporting wheelbeing journaled in eccentric relationship to the other, at least one webperforator fixedly secured to the outside periphery of saidweb-supporting wheel at a location for co-operation with individual onesof said cam rings, each said perforator being provided with a punchelement and an associated die element, the punch element ofsaidperforator underlying the cammingsurf'ace of the ring cooperatingwith it andbeing depressible by said cam ring into perforatingrelationship with the die element associated with said punch at thepoint of minimum clearance betweensaid cam and said web-supporting Wheeland being movable outwardly in a generally radial direction a sufficientamount to clear completely the surfaeeof a web carried by saidweb-supporting wheel at the point of maximum clearance: between said camring and saidweb-supporting wheel, means for cut-out slug removal, andmeans for rotating in unison said: cam rings and said web-supportingWheel.

2. A rotary perforating apparatus according to claim 1 wherein saidp'erforator comprises in combination a rigid base member provided with adie element, a spring sup port fixedly secured in cantileverrelationship to said base member, a punch element fixedly secured to theend of said support opposite the end at which said support issecured tosaid base, said punch element registering with said die element whensaid support is biased in the direction of said base member but clearingsaid die by an amount greater than the thickness of said web when saidsupport is in the unbiased state, and a spring leaf fixedly secured incantilever relationship to said base member, the free end of said springleaf overlying the end of said punch element opposite said die elementand being interposed between said oamming surface. of said cam ring andsaid punch element.

3. A rotary perforating apparatus according to claim 1 wherein saidperforator comprises in combination :a rigid base member provided with adie element, a rigid. support journaled at one end on said base member,a. punch e1ement fixedly secured to the end of said support opposite theend at which said support is journaled on said base member, and forkedfollower means fixedly secured to said support and engaging with saidcamming surface of said cam ring, whereby to bias said punch elementinto registration with said die element at said point of minimumclearance and lift said punch element free of said web at said point ofmaximum clearance.

4. A rotary perforating. apparatus comprising the combination of aframe, a stationary shaft member mounted in cantilever relationship onsaid frame, cam rings corresponding in number to the number of edges ofthe web it is desired to perforate journaled on said shaft, each of saidcam rings being provided with a oamming surface, a web-supporting wheeljournaled on said shaft, one of the pair consisting of said cam rings.and said web-supporting wheel being journaled in eccentric relationshipto the other, at least one web perforator fixedly secured to the outsideperiphery of said web-supporting wheel at a location for co-operationwith individual ones of said cam rings, each said perforator beingprovided with a punch element and an associated die element, the punchelement of said perforator underlying the camming surface of the camring co-operating with it and being depressible by said cam ring intoperforating relationship with the die element associated with said punchat the point of minimum clearance between said cam ring and saidweb-supporting wheel and being movable outwardly in a generally radialdirection a sufiicient amount to clear completely the surface of a webcarried by said web-supporting wheel at the point of maximum clearancebetween said cam ring and said web-supporting wheel, intercommunicatingconduits in said Web-supporting. wheel and said shaft to permit vacuumcut-out slug withdrawal from the die element of said perforator, andmeans for rotating in unison said cam rings and said web-supportingwheel.

5. A rotary perforating apparatus comprising the combination of a frame,a stationary shaft mounted in cantilever relationship on said frame, acam ring provided with a camming surface journaled on said shaft, aweb-supporting wheel journaled on said shaft, one of the pair consistingof said cam ring and said web-supporting wheel being journaled ineccentric relationship to the other, at

least one web perforator fixedly secured to the outsideperiphery of'saidweb-supporting wheel, each said perforator being provided with a'punchelement and an assoelated die element, the punch elementof saidperforator underlying the camming surface of'sai'd cam ring and beingdepressible by said cam ri'ng into perforating relation-- shipvv'ith'the die element associated with said punch at inter-communicatingconduits in said web-sup orting wheel and said shaft to permit vacuumcut-out slug withdrawal from the die element of said perf'orator, andmeans for rotating in unison said cam ring and said web-supportingwheel.

6 A rotary perforating apparatus comprising thecombination of'aframe,stationary shaft mounted in cantilever relationship on said frame, a camringprovided with a camming'surface journaded on said-shaft, 'aweb-supportingwheel journaled on said shaft, one of the pair consistingof said cam ring and said web-supporting wheel being iournaled ineccentric relationship to the other, at least one web perforator fixedlysecured to the outside periphery of said web-supporting wheel, each saidperforator being'provided with apunchelement and an associated dieelement, the punch element ofsaid perforator underlying the cam'm-ingsurface of said cam ring and being depressible' by said cam ring intoperforating relationship withthe die-element associated with said punchat the point of minimum clearance between said cam ring and said websup'portin'g wheel and being movable outwardly in a generally radialdirection a sulficient amount to clear completely the surface of a webcarried by said websupporting wheel at the point of maximum clearancebetween said cam ring and said web-supporting wheel, intercommunicat-ingconduits in said web-supporting wheel and said shaft to permit; vacuumcut-out slug Withdrawal from the die element of said perforator, apositive torquetransmitting coupling connected between said cam ring andsaid web-supporting wheel, and rotationaldrive means: connected to oneof the. pair consisting of said cam ring and said web-supporting wheel.

7. A rotary perforating apparatus comprising the combination of a frame,stationary shaft mounted in cantilever relationship on said frame,'twocam rings each provided with a carnrning surface journaled on said shaftwith said ramming surfaces adjacent one another, a web-supporting wheeliournaled on said shaft, one of the pair consisting of said cam ringsand said web-supporting wheel. being journaled in eccentric relationshipto the other, at

, least two web perforators fixedly secured to the outside periphery ofsaid websupporfing wheel, each of said perforators being provided with apunch element and an associated die element, one of said perforatorsbeing disposed on said wheel for cooperation with one of said cam ringsand the other of said perforators being disposed on said wheel. forco-operation with the other of said cam rings, the punch elements ofsaid perforators underlying,

the camming surfaces: of said cam rings in co-operation with each saidperforator and being depressible. by said cam rings into perforatingrelationship with the die elements associated with said punches at thepoint of minimum clearance between said cam rings and saidwebsup'porting wheel and being movable. outwardly in a gen erally radialdirection a suflicient amount to clear completely the surface of a webcarried by said web-support ing wheel at the. point of maximum clearancebetween said cam rings and said web-supporting Wheel, intercommunicatingconduits in said web-supporting wheel and said shaft to permit vacuumcut-out slug withdrawal from the die elements of said pcrforators, andmeans for rotat ing in unison said cam rings and said web-supportingwheel.

8. A rotary perforating apparatus comprising the combination of a frame,a stationary shaft journaled on said frame, camming memberscorresponding in number with the number of edges of the web it isdesired to perforate journaled on said shaft, a Web-supporting wheeljournaled on said shaft, one of the pair consisting of said cammingmembers and said web-supporting wheel being journaled in eccentricrelationship to the other, one or more web perforators fixedly securedto the periphery of said Websupporting wheel at a location forco-operation with individual ones of said camming members so as to beoperable inwardly and outwardly in sequence to perforate and clearcompletely a web carried by said web-supporting 10 wheel, means forcut-out slug removal, and means for ID- tating in unison said crammingmembers and said websupporting wheel.

9. A rotary perforating apparatus according to claim 8 having means forfeeding said web onto and removing said web from said web-supportingwheel.

References Cited in the file of this patent UNITED STATES PATENTS1,559,987 Reinhardt Nov. 3, 1925 1,910,395 Kreis May 3, 1933 2,619,177Praturlon Nov. 25, 1952 FOREIGN PATENTS 179,718 Great Britain May 28,1922

8. A ROTARY PERFORATING APPARATUS COMPRISING THE COMBINATION OF A FRAME,A STATIONARY SHAFT JOURNALED ON SAID FRAME, CAMMING MEMBERSCORRESPONDING IN NUMBER WITH THE NUMBER OF EDGES OF THE WEB IT ISDESIRED RO PERFORATE JOURNALED ON SAID SHAFT, A WEB-SUPPORTING WHEELJOURNALED ON SAID SHAFT, ONE OF THE PAIR CONSISTING OF SAID CAMMINGMEMBERS AND SAID WEB-SUPPORTING WHEEL BEING JOURNALED IN ECCENTRICRELATIONSHIP TO THE OTHER, ONE OR MORE WEB PERFORATORS FIXEDLY SECUREDTO THE PERIPHERY OF SAID WEBSUPPORTING WHEEL AT A LOCATION FORCO-OPERATION WITH INDIVIDUAL ONES OF SAID CAMMING MEMBERS SO AS TO BEOPERABLE INWARDLY AND OUTWARDLY IN SEQUENCE TO PERFORATE AND CLEARCOMPLETELY A WEB CARRIED BY SAID WEB-SUPPORTING WHEEL, MEANS FOR CUT-OUTSLUG REMOVAL, AND MEANS FOR ROTATING IN UNISON SAID CAMMING MEMBERS ANDSAID WEBSUPPORTING WHEEL.